One interesting plot could be that a group of Pokemon trainers enter the haunted mansion in search of a rare and powerful Pokemon. But once inside, they discover that the Pokemon they're looking for is actually a guardian of the mansion, protecting a dark secret. And they have to face various spooky challenges and ghost - type Pokemon along the way.
In some Pokemon Haunted Mansion fanfiction, there could be a plot where an old, abandoned Pokemon laboratory is hidden within the haunted mansion. A team of researchers had been conducting experiments there long ago, and something went horribly wrong. Now, the Pokemon in the mansion are mutated and dangerous. A new generation of Pokemon trainers must brave the haunted mansion to find a way to reverse the mutations and save the Pokemon.
Well, a plot might involve a young Pokemon trainer who gets lost near the haunted mansion. He or she is then drawn into the mansion by a strange force. Inside, the trainer finds that the Pokemon there are all in a state of unrest because of an evil curse. The trainer has to figure out how to break the curse with the help of their own Pokemon team and the friendly spirits within the mansion.
One idea could be a story where the characters discover a hidden room in the haunted mansion that holds the key to the mansion's dark past. Another could be about a group of friends who get trapped in the mansion during a storm and start experiencing strange paranormal events. Maybe a story where a character has the ability to communicate with the spirits in the mansion and tries to help them find peace.
Often, you'll see the main character as a young and brave Pokemon trainer. They might be accompanied by their starter Pokemon, like Pikachu or Charmander. There could also be a spooky old caretaker of the mansion who has some mysterious knowledge about the place and its secrets.
A third idea is to cross it with a post - apocalyptic world. The haunted mansion becomes a refuge in a desolate world. However, it has its own set of challenges as the ghosts and spirits within the mansion are not used to the new outside threats. The survivors from the apocalypse have to team up with the mansion's spectral inhabitants to defend against new, more dangerous threats.
In many Pokemon Litwick Mansion fanfictions, there are often tales of friendship. For example, a Litwick befriends a lost Pikachu who accidentally wandered into the mansion. The Litwick then helps the Pikachu navigate the maze - like halls of the mansion, all while they face various challenges like other spooky - type Pokemon that are territorial. This friendship grows and they eventually find a way out of the mansion together, with a newfound respect for each other's abilities.
One interesting plot could be the haunted angel's interaction with the Twilight characters in a way that reveals hidden secrets of the Twilight world. Maybe the angel has a past connection to one of the main characters and this connection stirs up new events and emotions.
A ghostly child would be a great character. This child is lost in the mansion, not really understanding that they are dead. The OC could try to help the child find peace. Also, a reclusive historian who has spent years studying the mansion from afar. He is reluctant to enter the mansion at first but is drawn in by the OC's adventures and his own thirst for knowledge about the place.
One interesting plot could be a trainer who turns into a Pikachu and has to navigate the Pokemon world from a different perspective. They might struggle with their new small size and electric abilities at first, but then learn to use them to their advantage in battles.
One interesting plot could be Ash forming a unique bond with each Pokémon in his harem. For example, he might have special training sessions with different Pokémon that are tailored to their individual strengths and weaknesses.
A plot where a character discovers a hidden Pokemon species that was never part of the original Pokemon Red game. This new Pokemon could have special abilities that change the dynamics of battles and exploration in the fanfiction.
In some pokemon zombies fanfiction, the plot could center around a scientific research facility that was working on some new Pokemon - related experiments. However, something went wrong and it led to the creation of zombie Pokemon. The story could then follow the scientists as they try to reverse the process, while also dealing with the chaos outside as the zombie Pokemon spread across the region.